Macronutrients 发表于 2025-3-23 12:52:29
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An Introduction to Variational Methods for Graphical Modelsxamples of graphical models, including the QMR-DT database, the sigmoid belief network, the Boltzmann machine, and several variants of hidden Markov models, in which it is infeasible to run exact inference algorithms. We then introduce variational methods, showing how upper and lower bounds can be f高谈阔论 发表于 2025-3-23 23:41:38
Improving the Mean Field Approximation Via the Use of Mixture Distributionshods make a completely factorized approximation to the posterior, which is unlikely to be accurate when the posterior is multimodal. Indeed, if the posterior is multi-modal, only one of the modes can be captured. To improve the mean field approximation in such cases, we employ mixture models as postSLING 发表于 2025-3-24 04:27:40
Introduction to Monte Carlo Methods high—dimensional problems such as arise in inference with graphical models. After the methods have been described, the terminology of Markov chain Monte Carlo methods is presented. The chapter concludes with a discussion of advanced methods, including methods for reducing random walk behaviour..Forfibula 发表于 2025-3-24 08:01:14
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A View of the Em Algorithm that Justifies Incremental, Sparse, and other Variants free energy and show that the M step maximizes this function with respect to the model parameters and the E step maximizes it with respect to the distribution over the unobserved variables. From this perspective, it is easy to justify an incremental variant of the EM algorithm in which the distribu